Improvement in combined inhalers and dental props



UNITED STATES PATENT QFFICE.

JOHN H. VICKERS, OF NORWICH, CONNECTICUT.

IMPROVEMENT IN COMBINED INHALERS AND DENTAL PROPS.

Specification forming part of Letters Patent No. 146,730, dated January20, 1874 application filed October 10, 1873.

' such as will enable others skilled in the art to which it pertains tomake and use it, reference being had to the accompanying drawin gs,which form part of this specification.

This invention relates to the combination of that character of dentistsmouth-pieces used for inhaling gas, and dentists props used for proppingopen the jaws, in such manner that, upon withdrawing the mouth-piecefrom the face after administering the gas, the prop will remain in themouth, holding the jaws apart for the dentists operations.

Figure 1 is a perspective view of my improved mouth-piece and prop whenscrewed into the usual metallic plate used to fit over the mouth. Fig. 2is a sectional view of mouthpiece and prop detached therefrom. Fig. 3 isthe prop with my spring attachment.

Like letters in the drawings indicate like parts.

From a dentists ordinary mouth-piece, A B

i A, used for inhaling gas, manufactured from wood, rubber, or otherproper material, I cut out the section B, running through the center ofthe same, to the depth of the base 0 C. The section cut away should beabout one-half inch in width in ordinary-sized mouth-pieces. In suchcenter space so formed I construct the prop B to fit closely and adjusteasily. The

prop B is made of hard wood or other proper material of sufficienttoughness to hold the jaws firmly apart, and is formed with a circularchannel-way, E, lengthwise through the center of the same, such channelbeing for the admission of the gas, or for the passage of a gas-tube, ifthought preferable to have a tube, part of A. A running through E, andconnected with A A at d d of the base (3 O. The top and bottom 0 O ofsaid prop B is made oval to correspond with the formation of themouthpiece A, and to receive the bearing of the jaws when they areclasped together. On the bot- -tom of the prop B, at K, I afiix thespring I with its plate H, as shown. \Vhen the combined mouth-piece andprop is inserted in the mouth, the plate presses under the jaw by thepower of the spring I, thus holding theprop in its proper position inthe mouth when the mouth-piece is withdrawn.

What I claim as my invention, and desire to secure by Letters Patent,ise 1. The prop B, in combination with the mouth-piece A A, whenconstructed substantially as and for the purposes hereinbefore setforth.

2. The spring I with its plate H, in combination with the prop B,substantially as and for the purposes hereinbefore set forth.

In testimony that I claim the foregoing I have hereunto set my hand this27th day of September, 1873.

JOHN H. vionnns.

Witnesses JAS. B. Corr,

WM. H. SHIELDS.

